sphereframe.java

mvc模式的示例代码。输入球的半径

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
/**
 * <p>Title: SphereFrame</p>
 * <p>Description: configure the basic info of JFrame</p>
 * <p>Copyright: Copyright (c) 2005</p>
 * @author Smart Lee
 * @version 1.1
 */
public class SphereFrame extends JFrame {
  boolean packFrame = false;
  JPanel contentPane;
  GridLayout borderLayout1 = new GridLayout(1, 2);

  //Construct the frame
  public SphereFrame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
      jbInit();
    }
    catch(Exception e) {
      e.printStackTrace();
    }
  }

  //Component initialization
  private void jbInit() throws Exception  {
    //Validate frames that have preset sizes
    //Pack frames that have useful preferred size info, e.g. from their layout
    if (packFrame) {
      this.pack();
    }
    else {
      this.validate();
    }
    //Center the window
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = this.getSize();
    if (frameSize.height > screenSize.height) {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width) {
      frameSize.width = screenSize.width;
    }
    this.setSize(600,300);
    // 使窗口居中
    this.setLocationRelativeTo(null);
    contentPane = (JPanel) this.getContentPane();
    contentPane.setLayout(borderLayout1);
    this.getContentPane().setBackground(SystemColor.controlLtHighlight);
    this.setTitle("Spheres: volume and surface area");
  }

  //Overridden so we can exit when window is closed
  protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
      System.exit(0);
    }
  }
}